Beschreibung

Changes the value of individual pixels based on the
intensity of each pixel compared to threshold. The
result is a high-contrast, two color image. Diese Funktion ist verfügbar, wenn Imagick gegen die ImageMagick-Version 6.2.9 oder höher kompiliert wurde.

Parameter-Liste

low

The low point

high

The high point

channel

Provide any channel constant that is valid for your channel mode. To
apply to more than one channel, combine channeltype constants using
bitwise operators. Refer to this
list of channel constants.